Herderite

Herderite is a mineral belonging to the apatite, phosphate group, with formula CaBe(PO₄)(F,OH). It forms monoclinic crystals, often twinned and variable in colour from colourless through yellow, green or purple.

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It is found in many parts of the world, often in pegmatites and associated with other apatite minerals.

It is named after Sigmund August Wolfgang von Herder, a mining official from Saxony.